(function($) {
	var types = [ 'DOMMouseScroll', 'mousewheel' ];
	if ($.event.fixHooks) {
		for ( var i = types.length; i;) {
			$.event.fixHooks[types[--i]] = $.event.mouseHooks;
		}
	}
	$.event.special.mousewheel = {
		setup : function() {
			if (this.addEventListener) {
				for ( var i = types.length; i;) {
					this.addEventListener(types[--i], handler, false);
				}
			} else {
				this.onmousewheel = handler;
			}
		},
		teardown : function() {
			if (this.removeEventListener) {
				for ( var i = types.length; i;) {
					this.removeEventListener(types[--i], handler, false);
				}
			} else {
				this.onmousewheel = null;
			}
		}
	};
	$.fn.extend({
		mousewheel : function(fn) {
			return fn ? this.bind("mousewheel", fn) : this
					.trigger("mousewheel");
		},
		unmousewheel : function(fn) {
			return this.unbind("mousewheel", fn);
		}
	});
	function handler(event) {
		var orgEvent = event || window.event, args = [].slice
				.call(arguments, 1), delta = 0, returnValue = true, deltaX = 0, deltaY = 0;
		event = $.event.fix(orgEvent);
		event.type = "mousewheel";
		if (orgEvent.wheelDelta) {
			delta = orgEvent.wheelDelta / 120;
		}
		if (orgEvent.detail) {
			delta = -orgEvent.detail / 3;
		}
		deltaY = delta;
		if (orgEvent.axis !== undefined
				&& orgEvent.axis === orgEvent.HORIZONTAL_AXIS) {
			deltaY = 0;
			deltaX = -1 * delta;
		}
		if (orgEvent.wheelDeltaY !== undefined) {
			deltaY = orgEvent.wheelDeltaY / 120;
		}
		if (orgEvent.wheelDeltaX !== undefined) {
			deltaX = -1 * orgEvent.wheelDeltaX / 120;
		}
		args.unshift(event, delta, deltaX, deltaY);
		return ($.event.dispatch || $.event.handle).apply(this, args);
	}
})(jQuery);